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// $Id: PredictionValue.hh 2641 2007-09-02 21:31:02Z flaterco $
/*
PredictionValue: A quantity in units of feet, meters, knots, or
knots squared. See also, Amplitude.
Copyright (C) 1998 David Flater.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class Amplitude;
class NullablePredictionValue;
// PredictionValues have a distinct initial state called 0 Zulu.
// 0 Zulu can be converted to any units, whether length or velocity.
// 0 Zulu can be added to any other PredictionValue regardless of its units.
// 0 Zulu will adopt the units of any PredictionValue added to it.
// 0 Zulu is comparable with any PredictionValue regardless of its units.
class PredictionValue {
public:
PredictionValue (); // Initialize to 0 Zulu.
PredictionValue (Units::PredictionUnits units, double value);
PredictionValue (Amplitude a);
PredictionValue (NullablePredictionValue npv); // Error if null.
inline const double val() const {
return _value;
}
void Units (Units::PredictionUnits units);
inline const Units::PredictionUnits Units () const {
return _units;
}
// Let int types be implicitly converted to double.
inline void operator*= (double multiplier) {
_value *= multiplier;
}
void operator/= (double divisor);
// With the exception of the 0 Zulu behaviors discussed above, these
// operators insist that both values must have the same units.
inline void operator+= (PredictionValue addend) {
if (addend._units == Units::zulu)
assert (addend._value == 0.0);
else if (_units == Units::zulu) {
assert (_value == 0.0);
operator= (addend); // Adopt units of addend
} else {
assert (_units == addend._units);
_value += addend._value;
}
}
void operator-= (PredictionValue subtrahend);
// Like += except that conversions are silently performed.
// Use only when you really mean it.
void convertAndAdd (PredictionValue addend);
// Print in the form -XX.YY units (padding as needed)
void print (Dstr &text_out) const;
// Same thing without padding, with abbreviated units.
void printnp (Dstr &text_out) const;
protected:
double _value;
Units::PredictionUnits _units;
};
// Let int types be implicitly converted to double.
inline const PredictionValue operator* (double a, PredictionValue b) {
b *= a;
return b;
}
inline const PredictionValue operator* (PredictionValue b, double a) {
b *= a;
return b;
}
const PredictionValue operator/ (PredictionValue b, double a);
// These work as long as the units are comparable.
const bool operator> (PredictionValue a, PredictionValue b);
const bool operator< (PredictionValue a, PredictionValue b);
const bool operator>= (PredictionValue a, PredictionValue b);
const bool operator<= (PredictionValue a, PredictionValue b);
const bool operator== (PredictionValue a, PredictionValue b);
const bool operator!= (PredictionValue a, PredictionValue b);
// These insist that both values must have the same units.
// 0 Zulu semantics are not (yet) implemented for these operations.
const PredictionValue operator+ (PredictionValue a, PredictionValue b);
const PredictionValue operator- (PredictionValue a, PredictionValue b);
const double operator/ (PredictionValue a, PredictionValue b);
const PredictionValue operator- (PredictionValue a);
const PredictionValue abs (PredictionValue a);
// Cleanup2006 Done
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